//暴力 80point 逆天了，样例太水了
#include<bits/stdc++.h>
using namespace std;

const int MAX_N = 5e8+5;
int a[MAX_N];

int readint();

int main(){
    const int n = readint();
    for(int i=1;i<=n;i++){
        const int m = readint();
        if(m==1){
            const int x=readint();
            a[x]++;
        }else if(m==2){
            const int x=readint();
            a[x]--;
        }else if(m==3){
            const int l=readint(),r=readint();
            int ans=0;
            for(int j=l;j<=r;j++){
                ans+=j*a[j];
            }
            cout<<ans<<endl;
        }else if(m==4){
            const int x = readint();
            for(int j=x;j>=0;j--){
                if(a[j]){
                    cout<<j<<endl;
                    goto out1;
                }
            }
            cout<<-1<<endl;
            out1:;
        }else if(m==5){
            const int x = readint();
            for(int j=x;j<MAX_N;j++){
                if(a[j]){
                    cout<<j<<endl;
                    goto out;
                }
            }
            cout<<-1<<endl;
            out:;
        }
    }
}

int readint(){
    int x=0,w=1;
    char ch=0;
    while(!isdigit(ch)){
        if(ch=='-')w=-1;
        ch=getchar();
    }
    while(isdigit(ch)){
        x=x*10+(ch-'0');
        ch=getchar();
    }
    return x*w;
}